Hairul wrote:
> hi!
> i am a biomedical engineering student. i am trying to find the heart
> rate from an ecg signal by detecting the RR interval of an ECG.
> anybody has the code for it? appreciate your help.

Michael Robbins wrote:
>
>
>> i am a biomedical engineering student. i am trying to find the
>> heart
>> rate from an ecg signal by detecting the RR interval of an ECG.
>> anybody has the code for it? appreciate your help.
>
> I am looking for similar code. I posted yesterday asking for it.
> If
> I do not find any soon, I will write my own and post it to the
> MATLAB
> File Exchange (http://newsreader.mathworks.com).

ok. I need to apply the Pam Tompkins algorithm to it but right now
I'm having difficulty implementing it into the program

Michael Robbins wrote:
>>i am a biomedical engineering student. i am trying to find the
>>heart
>>rate from an ecg signal by detecting the RR interval of an ECG.
>>anybody has the code for it? appreciate your help.
>
>
> I am looking for similar code. I posted yesterday asking for it. If
> I do not find any soon, I will write my own and post it to the MATLAB
> File Exchange (http://newsreader.mathworks.com).

I know it's trivial, but once you determine the RR interval in
milliseconds, you can get the heart rate by HR = 6e4./RR

Michael Robbins wrote:
>
>
> Michael Robbins wrote:
>>>i am a biomedical engineering student. i am trying to find
the
>>>heart
>>>rate from an ecg signal by detecting the RR interval of an
ECG.
>>>anybody has the code for it? appreciate your help.
>>
>>
>> I am looking for similar code. I posted yesterday asking for
it.
> If
>> I do not find any soon, I will write my own and post it to the
> MATLAB
>> File Exchange (http://newsreader.mathworks.com).
>
> I know it's trivial, but once you determine the RR interval in
> milliseconds, you can get the heart rate by HR = 6e4./RR
>

Hello!

What I do, not a very sophisticaded method, is to detrend the signal,
lowpass filter and normalize the signal. After that I locate the
peaks and keep the ones higher than some level.
If you give me your sampling frequency and an example file a can try
my program and if it works I'll send it to you.
email: patrikanderss@hotmail.com

Patrik Andersson wrote:
> Michael Robbins wrote:
>
>>
>>Michael Robbins wrote:
>>
>>>>i am a biomedical engineering student. i am trying to find
>
> the
>
>>>>heart
>>>>rate from an ecg signal by detecting the RR interval of an
>
> ECG.
>
>>>>anybody has the code for it? appreciate your help.
>>>
>>>
>>>I am looking for similar code. I posted yesterday asking for
>
> it.
>
>>If
>>
>>>I do not find any soon, I will write my own and post it to the
>>
>>MATLAB
>>
>>>File Exchange (http://newsreader.mathworks.com).
>>
>>I know it's trivial, but once you determine the RR interval in
>>milliseconds, you can get the heart rate by HR = 6e4./RR
>>
>
>
> Hello!
>
> What I do, not a very sophisticaded method, is to detrend the signal,
> lowpass filter and normalize the signal. After that I locate the
> peaks and keep the ones higher than some level.
> If you give me your sampling frequency and an example file a can try
> my program and if it works I'll send it to you.
> email: patrikanderss@hotmail.com
>
> /Patrik Andersson

Here's some code I wrote once to do it. It demonstrates triggered
averaging in addition to HR variability. I haven't looked at it in a
while so no guarantees. My signal was band-pass filtered before
sampling so I didn't have to detrend or low-pass filter.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function q2
% Ask question 2
clc
disp('The spectrum of the heart rate signal is shown in the Figure.')
disp('Note, however, that there are some problems with this spectrum!!')
disp(' ')
disp('The computer takes the heart-rate signal and subjects it to a');
disp('discrete-time Fourier transform, but this transform ASSUMES that');
disp('the samples of the signal are EVENLY SPACED in time. Yet, our');
disp('samples are not spaced evenly, but are rather spaced at intervals');
disp('of 1/beat (and the length of the beat clearly fluctuates!).');
disp('This operation thus results in a DISTORTED estimate of the spectrum');
disp('of the heart-rate. If we were using the results of this analysis
in');
disp('a clinical setting, such distortion could be dangerous - ');
disp('let''s fix it!');
disp(' ');
disp('...............Hit a key to continue.............');
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function q3
% Ask question 3
clc
disp('We CAN compute a heart-rate signal that provides values that are
evenly');
disp('spaced in time by using a method described by Berger et al (1986).');
disp('We''ll simply compute a heart-rate value every 0.25 sec (this
gives us');
disp('an evenly spaced signal with a 4 Hz sampling rate). Each heart-rate');
disp('value will be computed based on the distance between our time point');
disp('and the closest R-waves (see Matlab code to see how this is
computed.)');
disp(' ');
disp('The next plot will show the new heart-rate signal and the computed');
disp('spectrum. The degree of heart-rate variability, or Sinus
Arrhythmia,');
disp('is indicated by the amount of power in the spectrum (or the AREA
under');
disp('the spectral density function. The spectral density function is the');
disp('square of the spectral magnitude function.)');
disp(' ');
disp('...............Hit a key to continue.............');
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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